Q. No.Among the following statements, the correct set of statements are:
a.
\(B_2H_6 \) is Lewis acid.
b.
\(B_2H_6 \) has a planar structure.
c.
All B-H Bond lengths are equal in \(B_2H_6 \).
d.
In \(B_2H_6,\) four \(3C-2e^- \) bonds are present.
e.
\(B_2H_6 \) can be prepared by the reaction of \(BF_3 \) and \(NaBH_4 \).
1.
a, b, c, d, e
2.
a, e
3.
a, b
4.
d, e
| Assertion (A): | Carbon forms two oxides \(CO\) and \(CO_2\) where \(CO\) is neutral whereas \(CO_2\) is acidic. |
| Reason (R): | \(CO_2\) will combine with water to give carbonic acid and \(CO\) is soluble in water. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
C- C, Si -Si ,Ge – Ge, Sn – Sn is:
1. C-C > Si-Si > Ge-Ge > Sn-Sn
2. C-C > Si- Si > Ge- Ge ≈ Sn - Sn
3. C- C > Si -Si < Ge – Ge < Sn – Sn
4. C- C > Si – Si > Sn – Sn > Ge - Ge
Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behavior is that graphite :
| 1. | is a non-crystalline substance. |
| 2. | is an allotropic form of diamond. |
| 3. | has molecules of variable molecular masses like polymers. |
| 4. | has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds. |
Aluminium chloride exists as dinner, Al2Cl6 in the solid state as well as in the solution of non-polar solvents such as benzene. When dissolved in acidified aqueous solution, it gives:
1. \(\mathrm{Al}^{3+}+3 \mathrm{Cl}^{-}\)
2. \(\left[\mathrm{Al}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}+3 \mathrm{Cl}^{-} \)
3. \(\left[\mathrm{Al}(\mathrm{OH})_{6}\right]^{3-}+3 \mathrm{HCl}\)
4. \(\mathrm{Al}_{2} \mathrm{O}_{3}+6 \mathrm{HCl}\)
The structure of diborane (B2H6) contains:
| 1. | four 2C-2e- bonds and four 3C-2e- bonds |
| 2. | two 2C-2e- bonds and two 3C-3e- bonds |
| 3. | two 2C-2e- bonds and four 3C-2e- bonds |
| 4. | four 2C-2e- bonds and two 3C-2e- bonds |
In the structure of silicon dioxide:
| 1. | There are double bonds between silicon and oxygen atoms. |
| 2. | Silicon atom is bonded to two oxygen atoms. |
| 3. | Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms. |
| 4. | Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms. |
In view of the signs of for the following reactions:
The oxidation states more characteristic for lead and tin are respectively:
1. For lead +2, for tin +2
2. For lead +4, for tin +4
3. For lead +2, for tin +4
4. For lead +4, for tin +2
The correct statement about B2H6 is:
| 1. | The terminal B–H bonds have less p-character when compared to bridging bonds. |
| 2. | The two B–H–B bonds are not of the same length. |
| 3. | All B–H–B angles are 120°. |
| 4. | Its fragment, BH3, behaves as a Lewis base. |
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